TM Rename Fails: Error: Translation Memory was not saved

dear users,

i cannot rename server based TMs, if the TM has linked language resource template. The TM and the Language Resource were both migrated from GS2015 (Upgrade from GS2015 to GS 2017 CU7 and next to CU8). It does not happen with newly created TM or if i re-attach the Language Resource Template. I believe this is something new with GroupShare 2017 CU8. The renaming works in previous GS 2017 CU7 and previous version.

Following error is thrown:

All TMs are affected, if i unlink the Language Resource i can rename the TM.